Pythagoras tree: Difference between revisions

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@@ Line 446: / Line 446: @@
 void main() {
-  var basis = [((x: -200.0, y: 0.0), (x: 200.0, y: 0.0))];
+  var basis = [(Point(-200.0, 0.0), Point(200.0, 0.0))];
   final groups = Iterable.generate(12, (lvl) {
     final basis0 = basis;
@@ Line 452: / Line 452: @@
     final lvlPolygons = basis0.map((pp) {
       final (a, b) = pp;
-      final v = (x: b.x - a.x, y: b.y - a.y);
+      final v =  Point((b - a).y, (a - b).x);
-      final [c, d, w] = [a, b, v].map((p) => (x: p.x + v.y, y: p.y - v.x)).toList();
+      final (c, d) = (a + v, b + v);
-      final e = (x: c.x + w.x / 2, y: c.y + w.y / 2);
+      final e = (c + d + v) * 0.5;
       basis.addAll([(c, e), (e, d)]);
       return '<polygon points="${[a, c, e, d, c, d, b].expand((p) => [p.x, p.y]).join(' ')}"/>';